The funny thing is both Warrtalon and I are on DCEVOClub

 

Try turning down your gain and see if that helps

[rant]I got rid of my Profec B Spec-II becuase it had the most erratic boost holding attributes. It wouldn't hold in 3rd but 4th was fine. Or, 5th would creep etc. It was very weather sensitive and I had a hell of a time getting the thing to run right.

Part throttle boost control with the Profec was non-existant. Going from 20% throttle to 100% throttle the Profec would never hit target boost. Most of the time it would only hit 15psi. I slapped in a Hallman MBC and all was right with the world[/rant]

 

had the same problems and mods... got a tune... problem solved.

 

Yeah, the tuner installed the MBC hoses correctly and turned the freaking knob CCW until he got the right boost .... Good grief people, this is not rocket science, it's so simple that even I can do it. It requires basically no tools (well, maybe a couple of pairs of pliers) and will take about 10 minutes max.....

If that does not work, use the drawing I posted previously as a guide, and yank the POS MBC off the car and replace all the bits that were in there originally... Oh yeah, and quit screwing around with the car because you are not qualified to do it.

 

Listen jackass, it had nothing to do with the MBC, it was overboosting after I installed my TBE. The only other mod was an intake. I pulled the code. PO231 Engine Overboost. It was hitting boost cut. Had nothing to do with the MBC. I installed that later and the problem persisted until I got a tune.

 

FYI - most tunes get rid of the overboost code and fuel cut (along with the speed governer). So you may still be overboosting you will just never throw a code to show it.

 

nrcooled you are more than right. As i also mentioned in my conclusions is very weather sensitive. If you want the car to run at the same boost everyday you have to "play" all the time with it.


If i reduce gain it will not go to the desired psi. Now i have 6% gain and almost 24psi at 4000rpm. I have not tune it except a safc2 that i use. The best is to use AVCR but i dont plan on spending a lot in the car. At least for now

 

I guess you are either wanting to get banned or you have some sort of diagnosable pathology. The original poster had problems with overboosting after he installed a MBC. The most probable cause for those symptoms as he described them is the improper installation/adjustment of the MBC or the MBC being defective. You said that you had the same symptoms.... Hello?? who's the jackass?

I'm trying to help a guy based on my experience and the problem as he describes it. Most people who read in these forums and educate themselves know that aftermarket intakes are most often a source of problems. If you are going to add stuiff to your car that makes problems, then you are going to have to pay a tuner to screw with it. The MBC is a very simple device and if you don't go crazy with it it (stay at or below 19 psi) does not require any kind of tuning...
Of course, YMMV, etc. and by the way, you should refrain from needlessly insulting people. It makes you look bad

 

Please show me where the original poster stated that these problems occured right after he installed the MBC. All I saw in his original post was his list of mods and his problem. He didn't mention anything about the problem occuring directly after adding only one of the listed mods. I think everyone was just coming to the conclusion that it was his "crappy" MBC or his installation. I am simply offering an alternative diagnostic. Please correct me if I overlooked where he stated this.

As far as removing or raising the factory boost limit when getting a tune... yes that is exactly what is done. But getting a tune doesn't just encompass that.... so why use that as an argument?

FYI.. go ahead and report me to get banned. Everyone is so damn uptight and can't take what they dish out.

 

If you don't mind me adding my thoughts on this diagram:

MBC's bleed a little boost to reset the act diaghram. This loss is insignificant to boost but will make a BOV malfunction.

Much better off tieing into the compressor output up there where you got it capped ("disconnect hose and cap off this nipple").

Also, a poor mans MBC would like cause a spike and so would a long line from MBC output to actuator (keep short as you can)

 

Ive had the hallman both ways in the car not didnt see any spiking T'ed to the BOV line. The other way works too, but like has been posted in the past the boost is not as consistant

 

This has got me thinking,

teed off turbo outlet your using hot air to work the spring in the MBC
teed near intake the air is colder, I have no idea what this would cause but likely to have an effect.

I managed to get by with 8" of hose from mbc to wgact and source - no spike unless in 3rd or more but will only spike 0.5 psi.

 

Regardless of whether or not the problem started just after the boost controller install, your fix is not a fix at all. It's about as good as getting rid of a check engine light by pulling out the bulb. The problem is still there, you just don't see it. Either his boost controller is not working right or it is not connected right. MBC's are very cheap and it probably won't be hard to find another Evo owner in the DC area with one he could try. That would be the best solution. Getting a tune without being able to properly control boost is not the best plan.

-Paul

 

Problem solved fellas.. remounted my MBC to better spot(upright), its working fine.. my problem was the cap blow off of the turbo because i didnt have it zip tied...... i went over everything hose and zip tied all of them and now boost goes to 1.32bar to the floor 5th gear no spike/fuel cut.. PERFECT!!